[MERGE] Improve NestedTrees test coverage

[Aaron Bentley]

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Hi all,

This is a follow-on patch, requested by Ian, to increase the test
coverage of NestedTrees.

In the process, I discovered that iter_pathinfo_by_tree was giving the
wrong results in some cases.  So I went with a much simpler,
less-optimized implementation.  It's not clear to me whether optimizing
would provide tangible benefits, nor is it clear what algorithms would
provide best optimization, so I think it's best not to optimize it.

It was also an opportunity to think about the behaviour of get_path_info
with regard to tree-references.  Since it's easy to traverse from a tree
into a contained tree, but not the reverse, I decided to always return
the tree that contains the tree-reference, not the tree that the
tree-reference points to.

Aaron



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